World Russian race riot: Why did police detain hundreds who had nothing to do with it?

Sunday's riot in Moscow, sparked by a fight between a Russian man and a migrant man, underscored festering racial tensions – and officials' apparent unwillingness to counteract them.

Tatyana Makeyeva/Reuters

In the cell phone videos circulating online, rampaging crowds can be heard chanting "Russia for the Russians!” People throw bottles and rocks at police, set fires, overturn cars, smash a shopping center, and ransack the vegetable warehouse in a gritty industrial district of the Russian capital.